Paste aerogel heat preservation and heat insulation coating discharging device and control method thereof

Abstract

The invention provides a paste aerogel heat preservation and heat insulation coating discharging device and a control method thereof.The device is characterized in that a containing cavity is formed in a pressurizing tank body, an isolation assembly for isolating the containing cavity into an upper cavity and a lower paste chamber is arranged in the containing cavity, and a first feeding opening for conveying paste coating to the lower paste chamber is formed in the pressurizing tank body; the side, away from the upper cavity, of the lower paste chamber is of a conical structure, and the lowest point of the conical structure is connected with a first discharging pipe communicating with the lower paste chamber. The discharging mechanism comprises a first driving assembly connected with the isolation assembly and a guide assembly penetrating through the isolation assembly, and the first driving assembly is used for driving the isolation assembly to move along the guide assembly so as to extrude the paste coating in the paste discharging chamber towards the side close to the first discharging pipe; the spiral stirring head is arranged at the end, close to the first discharging pipe, of the guide assembly, and the outer diameter of the spiral stirring head is matched with the inner diameter of the first discharging pipe. According to the device, through the synergistic effect of mechanical extrusion and rotary stirring, fully-closed automatic discharging is achieved, the material cleaning time is eliminated, and continuous production is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paint dispensing and filling, in particular to a paste-like aerogel thermal insulation coating discharging device and a control method thereof. BACKGROUND

[0002] The paste-like aerogel thermal insulation coating has a unique nano-porous structure, presents extremely high viscosity and non-Newtonian fluid characteristics, and is prone to form a dense network structure under static conditions, resulting in a significant increase in yield stress. The viscous paste-like coating often adheres, accumulates and hangs on the wall at the discharge pipe, causing discharging difficulties. When the discharge pipe of the traditional pressure conveying device is blocked, the device needs to be stopped and disassembled, and the pipeline is manually dredged with tools. Such structural defects force the production line to be periodically stopped for manual cleaning, which takes more than 40 minutes each time, becoming a key bottleneck restricting continuous production. SUMMARY

[0003] In view of the above defects or deficiencies in the prior art, the present application aims to provide a paste-like aerogel thermal insulation coating discharging device and a control method thereof to realize continuous discharging of paste-like coating.

[0004] In a first aspect, the present application provides a paste-like aerogel thermal insulation coating discharging device, comprising: A pressurized tank is formed with a containing cavity, and a separation assembly is arranged in the containing cavity to separate the containing cavity into an upper chamber and a lower paste chamber. A first feed inlet is arranged on the pressurized tank to deliver paste-like coating to the lower paste chamber. The side of the lower paste chamber away from the upper chamber is in a conical structure, and the lowest point of the conical structure is connected with a first discharge pipe in communication with the lower paste chamber. A discharging mechanism includes a first driving assembly connected with the separation assembly and a guide assembly arranged through the separation assembly. The guide assembly is coaxially arranged with the first feed inlet along a first direction. The first driving assembly is used to drive the separation assembly to move along the guide assembly to extrude the paste-like coating in the lower paste chamber towards the side close to the first discharge pipe. A spiral stirring head is arranged at the end of the guide assembly close to the first discharge pipe. The outer diameter of the spiral stirring head is adapted to the inner diameter of the first discharge pipe. The spiral stirring head has an initial state and a stirring state. In the initial state, the spiral stirring head is arranged in the lower paste chamber. In the stirring state, the spiral stirring head is arranged in the first discharge pipe.

[0005] According to the technical scheme provided in the application, the first discharge pipe is provided with a buffer mechanism away from the pressurized tank body side, the buffer mechanism comprises a buffer cavity formed therein, and the buffer cavity is provided with a micro-pressure exhaust valve at the top; further comprising a second discharge pipe in communication with the buffer cavity, and a spiral feeder is arranged in the buffer cavity; the paste-like coating extruded in the first discharge pipe enters the buffer cavity, is sent to the second discharge pipe by the spiral feeder, and is discharged by the second discharge pipe.

[0006] According to the technical scheme provided in the application, the second discharge pipe is provided below with a transmission assembly, the transmission assembly comprises a conveying belt, and the conveying belt is provided with a plurality of bearing stations for placing a receiving bucket; and the bearing station is provided with a weighing assembly.

[0007] According to the technical scheme provided in the application, the guiding assembly is connected with a second driving assembly away from the spiral stirring head side, and the second driving assembly is used to drive the guiding assembly to move in the first direction in an extension and retraction mode; the spiral stirring head comprises a driving part and a stirring part, and the driving part is used to drive the stirring part to rotate around the first direction when the stirring part is placed in the first discharge pipe.

[0008] According to the technical scheme provided in the application, the isolation assembly comprises: an isolation plate, the isolation plate is matched with the shape of the containing cavity, and the isolation plate is connected with the output end of the first driving assembly away from the first discharge pipe side; a scraping assembly, the scraping assembly is arranged on the side of the isolation plate close to the first discharge pipe side and has a height always higher than the spiral stirring head, and the scraping assembly comprises: an annular guide groove, the annular guide groove is composed of a vertical part formed by the edge of the isolation plate extending along the first direction to the side close to the first discharge pipe and a horizontal part integrally formed perpendicularly to the vertical part; a plurality of wedge-shaped scraping plates, the plurality of wedge-shaped scraping plates are distributed in an array in the circumferential direction of the guiding assembly; the wedge-shaped scraping plate has a scraping edge that elastically abuts against the bottom of the isolation plate; a third driving assembly, the third driving assembly is used to drive the wedge-shaped scraping plate to rotate around the first direction, and when rotating, the end of the wedge-shaped scraping plate away from the guiding assembly is completely accommodated in the annular groove.

[0009] In the second aspect, the application provides a control method of a paste-like aerogel thermal insulation coating discharging device, which is realized based on the paste-like aerogel thermal insulation coating discharging device as described above and comprises the following steps: in response to a discharging instruction, the spiral feeder is controlled to be in a standby state, and the first driving assembly is controlled to drive the isolation assembly to move downward; start the conveying belt, and transport the receiving barrel to a bearing station below the second discharge pipe, and the weighing assembly is zeroed; monitor a first motor current of the screw feeder in real time; if the first motor current is greater than or equal to a first load current threshold, increase a speed of the screw feeder to a first feeding rotating speed for discharging; when it is monitored that a real-time material amount in the receiving barrel reaches 90% of a target material amount, reduce the first feeding rotating speed of the screw feeder to a precise feeding rotating speed, and reduce a descending speed of the isolation plate; when it is detected that the real-time material amount reaches the target material amount, stop the screw feeder and close a valve of the second discharge pipe; control the conveying belt to move to a next station, and reset the screw feeder to a standby rotating speed.

[0010] According to the technical scheme provided in the application, after the step of starting the conveying belt and transporting the receiving barrel to a bearing station below the second discharge pipe, the following steps are further included: monitor a first real-time pressure in the buffer cavity and a first motor current of the screw feeder in real time; if, within a first preset time length, the first real-time pressure is lower than a first pressure threshold and the first motor current is lower than a first current threshold, control the guide assembly to drive the screw stirring head to extend into the first discharge pipe, and start the stirring part to rotate.

[0011] According to the technical scheme provided in the application, the step of reducing the descending speed of the isolation plate includes the following steps: obtain a current descending speed of the isolation plate, and call a reference speed reduction equation; obtain a first target speed according to the current descending speed and the reference speed reduction equation, the reference speed reduction equation representing a relationship between a preset initial speed reduction ratio of the isolation plate, the current descending speed and the first target speed; control the current descending speed of the isolation plate to decrease to the first target speed; obtain a first real-time pressure in the buffer cavity in real time, and calculate a first pressure change rate; if the first pressure change rate is greater than or equal to a first preset change rate, correct the preset initial speed reduction ratio according to the first pressure change rate to obtain a second target speed, and control the descending speed of the isolation plate to decrease to the second target speed.

[0012] According to the technical scheme provided in the application, after the step of controlling the first driving assembly to drive the isolation assembly to descend, the following steps are further included: judging when the isolation assembly effectively contacts the paste paint in the lower paste chamber, and obtaining the effective downward displacement of the isolation assembly in real time; calculating a target theoretical discharge amount per unit time based on the tank structure parameters of the pressurized tank and the effective downward displacement; obtaining the actual cumulative discharge flow rate in real time through the flow sensor arranged on the inner wall of the first discharge pipe; calculating the instantaneous deviation rate of the target theoretical discharge amount and the actual cumulative discharge flow rate; if the instantaneous deviation rate does not meet the condition of increasing at least three times continuously or is less than the first warning threshold at least once, the discharging is continued; if the instantaneous deviation rate increases at least three times continuously and is greater than the first warning threshold, it is determined that the first discharge pipe has a gradual reduction in flow cross section.

[0013] According to the technical scheme provided in the present application, after determining that the first discharge pipe has a gradual reduction in flow cross section, the following steps are further included: controlling the spiral stirring head to extend into the first discharge pipe and rotate at a first rotating speed for a second preset time length; rechecking the instantaneous deviation rate in real time, and if the instantaneous deviation rate is less than the first warning threshold, the dredging is exited and the operation is resumed.

[0014] Compared with the prior art, the present application has the beneficial effects that the device can realize controllable conveying of high-viscosity paste throughout the whole process. Specifically, in the static pressure extrusion stage, the isolation assembly is precisely lowered along the guide shaft under the action of hydraulic drive, forming a gradual isostatic pressure on the lower paste chamber, and forcibly destroying the three-dimensional network structure of the paste, so that the material obtains initial fluidity. Moreover, when there is local blockage in the first discharge pipe, the spiral stirring head can be embedded in the first discharge pipe and rotated at a high speed, generating axial drag force and circumferential shear field, which effectively suppresses the poor discharge caused by local blockage. Thus, the spiral stirring head of the device is coaxially adapted with the discharge pipe and can be directly embedded in the discharge pipe for rotation, which can dredge the thickened paste in the discharge pipe in real time, avoids the sudden change of stage flow resistance, and eliminates the need for manual cleaning during shutdown. Through the synergistic effect of mechanical extrusion and rotary stirring, the device realizes fully-closed and automatic discharging, eliminates cleaning time, and realizes continuous production. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A structure schematic diagram of a paste aerogel thermal insulation coating discharging device provided by the embodiment of the present application; Figure 2 A structure schematic diagram of a scraping assembly provided by the embodiment of the present application; Figure 3 A cross-sectional structure schematic diagram of an isolation plate provided by the embodiment of the present application.

[0016] The text annotations in the figure represent: 1, first drive assembly; 2, guide assembly; 3, spiral stirring head; 4, pressurized tank body; 41, upper chamber; 42, lower paste chamber; 421, first feeding port; 5, isolation assembly; 51, wedge-shaped scraping plate; 52, annular guide groove; 53, sleeve; 54, third drive assembly; 6, first discharge pipe; 7, buffer mechanism; 71, second discharge pipe; 8, spiral feeder; 9, spiral drive assembly; 10, conveyor belt. DETAILED DESCRIPTION

[0017] The application will be further described below in conjunction with the drawings and examples. It should be understood that the specific examples described herein are intended to be merely illustrative of the application and not in limitation thereof. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0018] It should be noted that the examples in the present application and the features in the examples can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in conjunction with the examples.

[0019] Example 1 As mentioned in the background, in order to solve the problems in the prior art, the present application provides a paste-like aerogel thermal insulation coating discharging device, as shown in Figure 1 , which comprises: A pressurized tank body 4 is formed with a containing cavity inside, the containing cavity is provided with an isolation assembly 5 for isolating the containing cavity into an upper chamber 41 and a lower paste chamber 42, the pressurized tank body 4 is provided with a first feeding port 421 for delivering paste-like coating to the lower paste chamber 42, the side of the lower paste chamber 42 away from the upper chamber 41 is in a conical structure, and the lowest point of the conical structure is connected with a first discharge pipe 6 in communication with the lower paste chamber 42; Further, as shown in Figures 2-3 , the isolation assembly 5 comprises: An isolation plate is adapted to the shape of the containing cavity, and the side of the isolation plate away from the first discharge pipe 6 is connected with the output end of the first drive assembly 1; A scraping assembly is provided on the side of the isolation plate close to the first discharge pipe 6 and is always higher than the spiral stirring head 3 in height, and the scraping assembly comprises: An annular guide groove 52 is composed of a vertical part formed by the edge of the isolation plate extending along the first direction towards the side close to the first feeding pipe and a horizontal part integrally formed perpendicular to the vertical part; A plurality of wedge-shaped scraping plates 51 are arrayed circumferentially along the guide assembly 2; the wedge-shaped scraping plates 51 have scraping edges elastically fitted to the bottom of the isolation plate; A third driving assembly 54 is arranged to drive the wedge-shaped scraper 51 to rotate around the first direction, and the end of the wedge-shaped scraper 51 away from the guide assembly 2 is completely accommodated in the annular groove during rotation.

[0020] An outlet mechanism includes a first driving assembly 1 connected with the isolation assembly 5 and a guide assembly 2 arranged through the isolation assembly 5, the guide assembly 2 is coaxially arranged with the first inlet pipe along the first direction; the first driving assembly 1 is arranged to drive the isolation assembly 5 to move along the guide assembly 2 to extrude the paste-like coating in the lower paste chamber 42 to the side close to the first outlet pipe 6. A spiral stirring head 3 is arranged at the end of the guide assembly 2 close to the first outlet pipe 6, the outer diameter of the spiral stirring head 3 is matched with the inner diameter of the first outlet pipe 6, the spiral stirring head 3 has an initial state and a stirring state, in the initial state, the spiral stirring head 3 is arranged in the lower paste chamber 42, and in the stirring state, the spiral stirring head 3 is arranged in the first outlet pipe 6.

[0021] Specifically, the pressurized tank 4 is a vertical cylindrical pressure vessel, and an accommodation cavity is formed in the inside. A circular isolation plate is horizontally arranged in the middle of the accommodation cavity to divide the cavity into a closed upper chamber 41 and a lower paste chamber 42 (a storage area). The bottom of the lower paste chamber 42 is designed as a reverse conical structure with a top angle of 60°, and the lowest point of the top is vertically welded with the first outlet pipe 6 (the pipe diameter is matched with the paste viscosity). An elastic sealing ring is arranged between the edge of the isolation plate and the inner wall of the tank to ensure the air-tight isolation between the upper and lower chambers. A through hole is arranged in the center of the isolation plate, and a rotating sealing bearing is arranged for the guide assembly 2 to penetrate. The scraping assembly is integrated at the bottom of the isolation plate: an annular guide groove 52 is formed by extending from the edge of the lower surface of the isolation plate to the center, including a vertical groove section (extending downward by 20 mm vertically to the isolation plate) and a horizontal groove section (folding horizontally to the center with a depth of 15 mm). Four wedge-shaped scrapers 51 are arranged in a ring array at intervals of 90°, and the blade edge of the scraper is attached with a piece of elastic polytetrafluoroethylene, which is always tightly attached to the lower surface of the isolation plate and the tank wall.

[0022] Specifically, the guide assembly 2 is a hollow cylindrical guide rod, and a sleeve 53 is arranged outside the guide assembly 2. The isolation plate is hollow, and a third driving assembly 54 is arranged in the isolation plate. The third driving assembly 54 can be a micro motor, which is connected with the sleeve 53 in a meshing manner and can drive the sleeve 53 to rotate. The bottom of the sleeve 53 is connected with the scraper, and the sleeve 53 rotates to drive the scraper to rotate, thereby scraping the paste-like coating adhered to the bottom surface of the isolation plate.

[0023] Specifically, the spiral stirring head 3 is fixed to the bottom end of the guide rod and located in the lower paste chamber 42. It is to be noted that the clearance between the bottom surface of the guide rod and the spiral stirring head 3 (to allow the spiral stirring head 3 to rotate) is insufficient to extrude the paste paint in the lower paste chamber 42 into the hollow of the guide rod when the isolation plate is pressed down. Initial state: the spiral stirring head 3 is completely retracted into the lower paste chamber 42 (above the conical section); stirring state: the guide rod is driven by the second driving assembly to drive the stirring head to move down and extend into the inside of the first discharge pipe 6, and the gap between the outer diameter of the spiral stirring head 3 and the inner wall of the pipe is ≤1mm. The spiral stirring head 3 comprises: a driving part which is a waterproof motor fixed inside the guide assembly 2 (hollow of the guide rod). The stirring part is a spiral blade connected with the output shaft of the driving part (the outer diameter of the blade is slightly smaller than the inner diameter of the first discharge pipe 6).

[0024] Specifically, the first driving assembly 1 is a pneumatic cylinder or a hydraulic cylinder installed on the top of the tank. The output end of the first driving assembly 1 is connected with two push rods, and the push rods are connected with the isolation plate. The first driving assembly 1 pushes the isolation plate downward or lifts the isolation plate upward through the push rods.

[0025] The working process is described as follows: Stage 1: feeding and initial state: isolation plate position: driven by the hydraulic pressure to the highest point; scraping assembly: wedge-shaped scraping plate 51 is in a static state; spiral stirring head 3: guide rod is retracted to the high position, and the stirring head hovers in the middle of the conical cavity; stirring motor is powered off and static; feeding operation: paste is injected into the lower paste chamber 42 from the first feeding port 421 (filling volume is 80% of the volume); Stage 2: pressing and discharging, starting to press down: the first driving assembly 1 (hydraulic cylinder) pushes the isolation plate to press down at a constant speed, and the guide rod does not act under normal circumstances. The paste flows into the first discharge pipe 6 under pressure, and the normal working condition is that the spiral stirring head 3 does not move down and rotate, stage 3: resetting and scraping, lifting preparation: when the pressing and discharging are completed, the hydraulic cylinder reverses, and the scraping is triggered: when the isolation plate starts to move up, the third driving assembly 54 is started, and the wedge-shaped scraping plate 51 rotates synchronously to scrape, The isolation plate rises at a constant speed, and the scraping plate continuously scrapes the residual paste adhered to the bottom surface of the isolation plate during the rising process. The height of the scraping plate is always higher than the top of the spiral stirring head 3; reset: when the isolation plate reaches the highest point: the third driving assembly 54 stops, and the spiral stirring head 3 remains in the high position standby, waiting for the next discharging instruction.

[0026] Further, the first discharge pipe 6 is provided with a buffer mechanism 7 away from the pressurized tank body 4 side, the buffer mechanism 7 includes a buffer cavity formed therein, and the buffer cavity is provided with a micro-pressure exhaust valve at the top; further comprising a second discharge pipe 71 in communication with the buffer cavity, and a spiral feeder 8 is arranged in the buffer cavity; the paste paint extruded in the first discharge pipe 6 enters the buffer cavity, is sent to the second discharge pipe 71 by the spiral feeder 8, and is discharged from the second discharge pipe 71.

[0027] Specifically, the buffer cavity is a horizontal cylindrical barrel, which is connected with the outlet of the first discharge pipe 6 through a flange. A micro-pressure exhaust valve (normally closed, automatically depressurized when the pressure makes it difficult for the isolation assembly 5 to be pressed down) is installed at the top of the cavity. The screw feeder 8 is composed of a variable pitch screw and a matching motor inside the buffer cavity. The tail end of the screw is opposite to the outlet of the first discharge pipe 6, and the second discharge pipe 71 is arranged at any position in the screw path. The size of the screw blade of the variable pitch screw is matched with the buffer cavity. The screw feeder 8 is driven by the screw driving assembly 9, and the rotating speed is adjustable. The paste is pushed towards the second discharge pipe 71 through the rotation of the screw blade.

[0028] In a preferred embodiment, a conveying assembly is arranged below the second discharge pipe 71. The conveying assembly includes a conveying belt 10, which has a plurality of bearing stations for placing receiving barrels. The bearing stations are provided with a weighing assembly.

[0029] Specifically, the conveying assembly is a conveying belt 10, which is located directly below the second discharge pipe 71 and can run horizontally. The bearing stations are equidistantly distributed metal trays, each of which is integrated with a weighing sensor at the bottom. The receiving barrels are fixed on the bearing stations, and the barrel openings are aligned with the outlet of the second discharge pipe 71. The empty barrels are placed on the bearing stations, and the weighing assembly is zeroed. When the weight of the paste in the barrel reaches a preset value, the conveying belt 10 moves to the next station to replace the barrel.

[0030] In a preferred embodiment, a second driving assembly is connected to the side of the guide assembly 2 away from the screw stirring head 3, which is used to drive the guide assembly 2 to move and stretch in the first direction. The screw stirring head 3 includes a driving part and a stirring part. The driving part is used to drive the stirring part to rotate around the first direction when the stirring part is placed in the first discharge pipe 6.

[0031] Specifically, the guide assembly 2 is a rigid guide rod which vertically penetrates the central through hole of the isolation plate. The top end extends to the upper chamber 41 and is connected with the output end of the second driving assembly. The bottom end extends to the conical region of the lower paste chamber 42. The second driving assembly is a hydraulic cylinder installed on the top of the tank.

[0032] So far, the paste-like aerogel thermal insulation coating discharging device includes a pressurized tank 4, a discharging mechanism, and a screw stirring head 3 which work together. The pressurized tank 4 is used to store and pressurize the paste-like coating. The discharging mechanism drives the isolation assembly 5 to extrude the coating. The screw stirring head 3 solves the problem of blockage of high-viscosity coating in the pipeline. The bottom of the device is additionally provided with a buffer mechanism 7 to stabilize the discharge flow. The end is automatically weighed and received through the conveying assembly. The isolation assembly 5 is integrated with a self-cleaning scraping structure to ensure that there is no residue in the tank.

[0033] Example 2 The embodiment provides a control method of a paste aerogel thermal insulation coating discharging device, and is realized based on the paste aerogel thermal insulation coating discharging device as shown in the embodiment 1, and comprises the following steps: Figure 2 S1, in response to a discharging instruction, the screw feeder 8 is controlled to be in a standby state, and the first driving assembly 1 is controlled to drive the isolation assembly 5 to move downwards; S2, the conveying belt 10 is started to convey the receiving barrel to a bearing station below the second discharging pipe 71, and the weighing assembly is cleared; S3, the first motor current of the screw feeder 8 is monitored in real time; S4, if the first motor current is greater than or equal to a first load current threshold, the speed of the screw feeder 8 is increased to a first feeding rotating speed to discharge; S5, when it is monitored that the real-time filling amount of the receiving barrel reaches 90% of the target filling amount, the first feeding rotating speed of the screw feeder 8 is reduced to a precise feeding rotating speed, and the downward moving speed of the isolation plate is reduced; S6, when it is detected that the real-time filling amount reaches the target filling amount, the screw feeder 8 is stopped and the valve of the second discharging pipe 71 is closed; S7, the conveying belt 10 is controlled to move to the next station, and the screw feeder 8 is reset to a standby rotating speed.

[0034] Specifically, the starting stage: after receiving the discharging instruction, the screw feeder 8 maintains a standby rotating speed (10 rpm), the first driving assembly 1 (a hydraulic cylinder) drives the isolation plate to move downwards at a speed of 50 mm / min, the conveying belt 10 moves an empty barrel to be directly below the second discharging pipe 71, the weighing sensor is cleared, and the motor current of the screw feeder 8 is monitored in real time (a sampling frequency is 10 Hz); the discharging control: condition 1: if the motor current is greater than or equal to 18 A (a first load threshold), the speed is increased to 35 rpm (a first feeding rotating speed); condition 2: when the weighing value reaches 90% of the target value, the screw feeder 8 is reduced to 15 rpm (a precise feeding rotating speed), and the downward moving speed of the isolation plate is reduced to 20 mm / min; a termination condition: when the weighing value is equal to the target value, the screw feeder 8 is stopped, the pneumatic valve of the second discharging pipe 71 is closed, and the conveying belt 10 is reset to the next station, and the screw feeder 8 returns to the standby rotating speed.

[0035] The embodiment can realize the technical effect that the speed is increased through the current threshold, the idling caused by poor flowability of the paste in the initial stage is avoided, the speed is reduced at the 90% weight node, and the splashing caused by shear thinning of the paste (the thixotropic index of the aerogel paste is greater than 4) is reduced.

[0036] ​In a preferred embodiment, after the step of starting the conveyor belt 10 and transporting the receiving bucket to the loading station under the second discharge pipe 71, the method further comprises the following steps: monitoring in real time a first real-time pressure in the buffer cavity and a first motor current of the auger feeder 8; If the first real-time pressure is lower than a first pressure threshold and the first motor current is lower than a first current threshold within a first preset time duration, the method further comprises the step of:

[0037] Specifically, the parameters are monitored in real time as follows: the first real-time pressure value P in the buffer cavity is continuously collected by a piezoelectric pressure sensor; the first motor current value I of the motor of the auger feeder 8 is obtained in real time by a closed-loop Hall current sensor; the sampling frequency is set to 100 Hz, and the data is subjected to mean filtering processing by a PLC. The clogging determination conditions are as follows: when the following two conditions are met at the same time and the duration is greater than or equal to 5 seconds (the first preset time duration), it is determined that there is early clogging: condition one: P < 0.15 MPa (this threshold is 50% of the lower limit of the normal working pressure); condition two: I < 12 A (this threshold is 40% of the rated load current of the auger feeder 8).

[0038] Technical principle: When the aerogel paste locally agglomerates in the pipeline, the buffer cavity pressure decreases due to the reduced discharge amount, and the driving current of the auger feeder 8 decreases due to the reduced load. The joint determination of the two parameters can exclude false positives of a single sensor.

[0039] Specifically, the unblocking execution action is as follows: After the unblocking instruction is triggered, the following steps are performed: (1) The second driving assembly drives the guide assembly 2 to extend downward at a speed of 20 mm / s, and drives the auger stirring head 3 to completely enter the first discharge pipe 6; (2) The brushless motor of the stirring part is started to rotate at a speed of 60 rpm (the output torque is limited to 50 N·m); (3) The unblocking duration is 10 seconds, or the unblocking is terminated immediately when the real-time pressure P > 0.3 MPa.

[0040] Exit mechanism: After the termination condition is reached, the stirring part stops rotating, and the guide assembly 2 is retracted to the initial position at a speed of 30 mm / s (the auger stirring head 3 completely exits the first discharge pipe 6); The system automatically resumes the discharge process and re-monitors the pressure and current parameters.

[0041] The double-threshold hysteresis control algorithm of the embodiment improves the early blockage identification accuracy and reduces the false positive rate compared with the traditional single-parameter detection method; the upper limit of the unblocking torque is limited to avoid damaging the aerogel nanoporous structure, and the paste temperature rise is controlled within 3°C; the 10-second timed unblocking can break the paste agglomerate block below Φ25 mm, and the flow cross section is restored to the initial state as much as possible.

[0042] In a preferred embodiment, the lowering the moving speed of the isolation plate comprises the following steps: obtaining a current moving speed of the isolation plate, and calling a reference speed reduction equation; obtaining a first target speed according to the current moving speed and the reference speed reduction equation, the reference speed reduction equation representing a relationship between a preset initial speed reduction ratio of the isolation plate, the current moving speed and the first target speed; controlling the current moving speed of the isolation plate to decrease to the first target speed; obtaining a first real-time pressure in the buffer cavity in real time, and calculating a first pressure change rate; if the first pressure change rate is greater than or equal to a first preset change rate, correcting the preset initial speed reduction ratio according to the first pressure change rate to obtain a second target speed, and controlling the moving speed of the isolation plate to decrease to the second target speed.

[0043] Specifically, the control process of lowering the moving speed of the isolation plate is executed according to the following steps: Firstly, the speed reference is obtained: the current moving speed V0 (unit: mm / min) of the isolation plate is read in real time, which is obtained by differential calculation through the displacement sensor of the hydraulic cylinder; the reference speed reduction equation V1=K×V0 is called from the PLC memory, where K is the preset initial speed reduction ratio (default value 0.6).

[0044] Then, the initial speed reduction is executed: the speed of the isolation plate is controlled to decrease to V1 by the hydraulic system the speed reduction process is completed uniformly within 2 seconds to avoid pressure impact.

[0045] At the same time, dynamic pressure monitoring and secondary correction are performed: the buffer cavity pressure data is collected in real time (sampling frequency 10 Hz), and the pressure change rate R within a 1-second time window is calculated: R p =|ΔP / Δt|; if R p ≥ 0.02MPa / s (first preset change rate), the speed reduction ratio dynamic correction is started: correction formula: K ’ =K×[1 - 0.2×( R p- 0.02)], calculate secondary target speed: V2= K ’ ×V1; immediately control the hydraulic system to reduce the speed to V2.

[0046] The present embodiment optimizes the deceleration amplitude in real time through pressure change rate feedback, compresses the buffer cavity pressure fluctuation range, avoids the thixotropic effect caused by the sudden change of shear rate, and accurately fills the error in the feeding stage.

[0047] In a preferred embodiment, after the control of the first driving assembly 1 driving the isolation assembly 5 to move downward, the following steps are further included: When the isolation assembly 5 effectively contacts the paste-like coating in the lower paste chamber 42, the effective downward displacement of the isolation assembly 5 is obtained in real time; Based on the tank structure parameters of the pressurized tank 4 and the effective downward displacement, the target theoretical discharge amount per unit time is calculated; The actual cumulative discharge flow rate is obtained in real time through the flow sensor arranged on the inner wall of the first discharge pipe 6; The instantaneous deviation rate of the target theoretical discharge amount and the actual cumulative discharge flow rate is calculated; If the instantaneous deviation rate does not meet the condition of increasing at least three times continuously, or at least once less than the first warning threshold, the discharge continues; if the instantaneous deviation rate increases at least three times continuously and all exceeds the first warning threshold, it is determined that the first discharge pipe 6 has a progressive flow passage cross-section reduction.

[0048] Specifically, the progressive clogging diagnosis method comprises the following steps: Contact determination and displacement monitoring: When the hydraulic cylinder output pressure suddenly increases by more than 5MPa (the threshold is marked by the material yield stress), it is determined that the isolation plate effectively contacts the paste surface; The effective downward displacement ΔH (unit: mm) is recorded in real time, and the sampling interval is 0.5 seconds.

[0049] Theoretical discharge amount calculation: call the tank structure parameters (including tank radius and paste density); calculate the theoretical discharge amount Qa per unit time.

[0050] Actual flow acquisition: the actual cumulative flow Qt is obtained in real time through the electromagnetic flowmeter (accuracy ±0.5%) in the first discharge pipe 6.

[0051] Deviation rate diagnosis algorithm: Calculate the instantaneous deviation rate: δ= [(Qt- Qa) / Qt]×100%; Three sampling points (time interval 1 second) are continuously monitored, and if the following conditions are met at the same time: Condition one: δ n >δ n-1>δ n-2 (Strictly monotonic increasing); Condition two: δ n ≥8% (First warning threshold); Then determine that the first discharge pipe 6 has progressive flow cross-section reduction.

[0052] This embodiment considers that under ideal laminar flow state, the paste flow should be linearly related to the piston displacement (continuity equation), so the physical meaning of deviation increment can be used to indirectly determine whether the first discharge pipe 6 has progressive flow cross-section reduction: the thickness of the paste adhesion layer on the pipe wall increases by a certain thickness, which reduces the flow area by a certain proportion (this proportion is related to the pipe diameter of the first discharge pipe 6 and can be obtained by experiment), resulting in a monotonic increasing characteristic of δ.

[0053] In a preferred embodiment, after determining that the first discharge pipe 6 has progressive flow cross-section reduction, the following steps are further included: Control the screw stirring head 3 to extend into the first discharge pipe 6 and rotate at a first rotating speed for a second preset time length; Real-time review the instantaneous deviation rate, if the instantaneous deviation rate is less than the first warning threshold, exit the dredging and resume operation.

[0054] Specifically, the dredging control process of progressive blockage performs the following steps: Dredging instruction trigger: When it is determined that there is progressive flow cross-section reduction, the PLC generates a dredging instruction; Immediately pause the down movement of the isolation plate and maintain the current displacement state.

[0055] The dredging execution steps are: (1) Stirring head positioning: The second driving assembly drives the guide assembly 2 to advance downward at a speed of 15 mm / s; The advancing distance is set to cover the entire first discharge pipe 6 as much as possible; (2) Rotating dredging: The brushless motor of the stirring part is started to rotate at a rotating speed of 60 rpm (the output torque is limited to 50 N·m); The continuous rotating time length is fixed at 10 seconds; (3) Process monitoring: Real-time calculation of instantaneous deviation rate δ; sampling frequency 1 Hz, sliding average filtering is used.

[0056] Dredging effect verification: After rotation, the following determination is immediately performed: If δ < 5% (dredging success threshold), exit the dredging process; If δ≥5%, then extend the rotation to 30 seconds and re-verify; If δ≥8% after the second verification, trigger an audible alarm and require manual intervention.

[0057] After successful unblocking: the stirring section stops rotating, the guide assembly 2 is retracted to the initial position, the isolation plate is restored to its lowered position and the discharge process, and the above-described monitoring of the progressive blockage of the first discharge pipe 6 is restarted.

[0058] The principles and implementation manners of the present application are described herein by using specific examples, and the above example descriptions are only used to help understand the method of the present application and its core idea. The above descriptions are only preferred embodiments of the present application, and it should be pointed out that, due to the limited nature of the language expression, there are objectively infinite specific structures, and for ordinary skilled persons in the technical field, on the premise of not deviating from the principles of the present application, a number of improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A paste-like aerogel thermal insulation paint discharging device, characterized by, The application relates to a pressurized tank body (4) which is internally provided with a containing cavity, a separation assembly (5) for separating the containing cavity into an upper cavity (41) and a lower paste cavity (42), a first feeding port (421) for feeding paste paint into the lower paste cavity (42), and a first discharging pipe (6) connected to the lower paste cavity (42) and communicating with the lower paste cavity (42). The discharging mechanism comprises a first driving assembly (1) connected to the separation assembly (5) and a guide assembly (2) penetrating through the separation assembly (5), the guide assembly (2) is coaxially arranged with the first feeding pipe along a first direction, and the first driving assembly (1) is used for driving the separation assembly (5) to move along the guide assembly (2) so as to extrude the paste paint in the lower paste cavity (42) to the side close to the first discharging pipe (6). A spiral stirring head (3) is arranged at the end of the guide assembly (2) close to the first discharging pipe (6), the outer diameter of the spiral stirring head (3) is matched with the inner diameter of the first discharging pipe (6), the spiral stirring head (3) has an initial state and a stirring state, in the initial state, the spiral stirring head (3) is arranged in the lower paste cavity (42), and in the stirring state, the spiral stirring head (3) is arranged in the first discharging pipe (6). A buffer mechanism (7) is arranged at the side of the first discharging pipe (6) away from the pressurized tank body (4), the buffer mechanism (7) comprises a buffer cavity formed in the buffer mechanism (7), a micro-pressure exhaust valve is arranged at the top of the buffer cavity, a second discharging pipe (71) communicating with the buffer cavity is further arranged, a spiral feeder (8) is arranged in the buffer cavity, the paste paint extruded from the first discharging pipe (6) enters the buffer cavity, is sent to the second discharging pipe (71) by the spiral feeder (8), and is discharged by the second discharging pipe (71).

2. The paste-like aerogel thermal insulation paint discharging apparatus according to claim 1, characterized in that: A transmission assembly is arranged below the second discharging pipe (71), the transmission assembly comprises a conveying belt (10), a plurality of bearing stations are arranged on the conveying belt (10), the bearing stations are used for placing receiving barrels, and a weighing assembly is arranged on the bearing stations.

3. The paste-like aerogel thermal insulation paint discharging apparatus according to claim 2, characterized in that: A second driving assembly is connected to the side of the guide assembly (2) away from the spiral stirring head (3), the second driving assembly is used for driving the guide assembly (2) to move along the first direction, the spiral stirring head (3) comprises a driving part and a stirring part, and the driving part is used for driving the stirring part to rotate around the first direction when the stirring part is arranged in the first discharging pipe (6).

4. The paste-like aerogel thermal insulation paint discharging apparatus according to claim 3, characterized in that: The separation assembly (5) comprises a separation plate which is matched with the shape of the containing cavity, and the side of the separation plate away from the first discharging pipe (6) is connected to the output end of the first driving assembly (1).

5. The paste-like aerogel thermal insulation paint discharging apparatus according to claim 3, characterized in that: ​ ​ A scraping assembly is arranged on the side of the isolation plate close to the first discharge pipe (6) and is always higher than the spiral stirring head (3), and the scraping assembly comprises: An annular guide groove (52) formed by a vertical part extending along the first direction from the edge of the isolation plate to the side close to the first feeding pipe and a transverse part integrally formed with the vertical part; A plurality of wedge-shaped scraping plates (51) arranged in an array along the circumference of the guide assembly (2); the wedge-shaped scraping plate (51) has a scraping edge that elastically fits the bottom of the isolation plate; A third driving assembly (54) for driving the wedge-shaped scraping plate (51) to rotate around the first direction; when rotating, the end of the wedge-shaped scraping plate (51) away from the guide assembly (2) is completely accommodated in the annular groove.

6. A method of controlling a paste-like aerogel thermal insulation paint dispensing device, implemented on the basis of a paste-like aerogel thermal insulation paint dispensing device according to any one of claims 3-5, characterized in that: The method comprises the following steps: In response to a discharge instruction, the spiral feeder (8) is controlled to be in a standby state, and the first driving assembly (1) is controlled to drive the isolation assembly (5) to move downward; The conveying belt (10) is started to transport the receiving bucket to a bearing station below the second discharge pipe (71), and the weighing assembly is reset to zero; The first motor current of the spiral feeder (8) is monitored in real time; If the first motor current is greater than or equal to a first load current threshold, the speed of the spiral feeder (8) is increased to a first feeding speed for discharging; When it is monitored that the real-time material amount in the receiving bucket reaches 90% of the target material amount, the first feeding speed of the spiral feeder (8) is reduced to a precise feeding speed, and the downward movement speed of the isolation plate is reduced; When it is detected that the real-time material amount reaches the target material amount, the spiral feeder (8) is stopped and the valve of the second discharge pipe (71) is closed; The conveying belt (10) is controlled to move to the next station, and the spiral feeder (8) is reset to a standby speed.

7. The control method of claim 6, wherein: After the step of starting the conveying belt (10) to transport the receiving bucket to a bearing station below the second discharge pipe (71), the method further comprises the following steps: The first real-time pressure in the buffer cavity and the first motor current of the spiral feeder (8) are monitored in real time; If, within a first preset time period, the first real-time pressure is lower than a first pressure threshold and the first motor current is lower than a first current threshold, the guide assembly (2) is controlled to drive the spiral stirring head (3) to extend into the first discharge pipe (6), and the stirring part is started to rotate.

8. The control method of claim 6, wherein: The step of reducing the downward movement speed of the isolation plate comprises the following steps: The current downward movement speed of the isolation plate is obtained, and a reference speed reduction equation is called; According to the current downward movement speed and the reference speed reduction equation, a first target speed is obtained, and the reference speed reduction equation represents the relationship between a preset initial speed reduction ratio of the isolation plate, the current downward movement speed and the first target speed; The current downward movement speed of the isolation plate is controlled to be reduced to the first target speed; The first real-time pressure in the buffer cavity is obtained in real time, and a first pressure change rate is calculated; If the first pressure change rate is greater than or equal to a first preset change rate, the preset initial deceleration ratio is corrected according to the first pressure change rate to obtain a second target speed, and the descending speed of the isolation plate is controlled to decrease to the second target speed.

9. The method of claim 7, wherein the method further comprises: The control of the first driving assembly (1) to drive the isolation assembly (5) to descend further comprises the following steps: When the isolation assembly (5) effectively contacts the paste-like paint in the lower paste chamber (42), the effective descending displacement of the isolation assembly (5) is obtained in real time. Based on the tank structure parameters of the pressurized tank (4) and the effective descending displacement, the target theoretical discharge amount per unit time is calculated. The actual cumulative discharge flow rate is obtained in real time through the flow sensor arranged on the inner wall of the first discharge pipe (6). The instantaneous deviation rate of the target theoretical discharge amount and the actual cumulative discharge flow rate is calculated. If the instantaneous deviation rate does not satisfy the condition of increasing at least three times continuously or is less than a first warning threshold at least once, the discharging is continued; if the instantaneous deviation rate increases at least three times continuously and is greater than the first warning threshold, it is determined that the first discharge pipe (6) has a gradual reduction in flow cross section.

10. The method of claim 9, wherein the method further comprises: After determining that the first discharge pipe (6) has a gradual reduction in flow cross section, the following steps are further included: The screw stirring head (3) is controlled to extend into the first discharge pipe (6) and rotate at a first rotating speed for a second preset time length. The instantaneous deviation rate is reviewed in real time, and if the instantaneous deviation rate is less than the first warning threshold, the dredging is exited and the operation is resumed.

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